Commutator-grinder.



No. 855,877. PATBNTED JUNE 4, 1907. E. S. BRYANT & H J. BERY. GOMMUTATORGRINDER.

APPLIGATIOK FILED APR. 7, 1906.

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OOMMUTATOR GRINDER.

APPLICATION FILED APR.7.1906.

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x MB a 4 01 u k 3 n M 3 Q B 3 w w w F M? g c U My 8 m 5 maew O 6 e u m gm w 5 7 s 5 w 5 m n 1 m PATENTED JUNE 4, 1907. a, s. BRYANT a; H. J.BERY;

GOMMUTATOE GRINDER.

AIPLIOATION FILED APR. 7, 1906.

3 SHEETS-SHEET 3.

FIGJE.

guucnturg ASBQN UNITED (STATES PATENT OFFICE.

: ELLSWORTI-I S. BRYANT AND HENRY J. BERY, OF DETROIT, MICHIGAN.

COMMUTATOR-GRINDER.

To all whom it may c oncr'n:

Be it known that we, ELLSWORTH S. BRY- ANT and HENRY J. BERY, citizensof the United State s,residjnfg at Detroit; in the county of Vayne andState of Michigan,

I have invented a new and Improved Commutator-Gnndenof which thefollowing is a specification. i

.Our improvements relate to mechanism for grinding commutators ofelectric generators and motors that have become worn,"

without dismantling the machine, and the "objects ofour improvementsare,- to provrde 'a device of this character which may bereadilyattached to dynamos and motors of j d fleren't sizes and types;to provide grinding mechanism that is accurately adjustable withreference to the commutator; and to' 1 provide a device of thischaracter that can be from the' electric machine.

easily and 'quickly attached and detached Our invention consists in aslidable hollow shaft or sleeve within which an emery wheel arbor' isrevolubly mounted.

It also consists in adjustable mechanism adapted. to be mounted on oneof the brush holders of a generator or motor, which mach aiiisni isprovided with bearings for the arbor carrying sleeve. I

It consists further in the specific details illustrated in the accomanying drawings cated in dotted lines.

and particularly describe( tion. I

In the accompanying drawings, Figure 1 is a view of a dynamo havingbrushes removed from several of the brush holders and our imin thespecificaproved commutator grinder attached-to said machine.

Fig. 2 is a lap. of our roved grinding mechanism, the emery whee arborcarrying sleeve and connections beifng indi- Figs. 3and 4 are views ofthe clamp for securing the apparatus to a brush holder of an electricmachine. Fig.

. p is a view of the frame from the o 5 is a view, artly in section onthe line B-B of Fig. 7, oiframe of the apparatus.. Fig. 6 Posite end.Fig. 7 is a plan of theframe on the a line A.-A of 6. Fig. 8.isalongitudinal polishing, wheel.

section of the emery wheel arbor, sleeve and motor. Fig. '9 is a sideview of one form of Fig- 10 is a cross section on the line C-C of Fig.9;. Figs. 11 and 12are details of .the foot of a brace or prop. Figs.

13 and 14 are details'of a substitute support to be used where sui ablebrush 0 ers,

Specification of Letters Patent. Application filed April 1, 1906. SerialNo. sienna.

perfectly c Patented June 4, 1907.

are wanting.

whereto the grinder frame maybe attached, I

Similar reference characters refer'to like parts throughout the severalviews.

To obviate the necessity of dismantling electric generators and motorswhen the commutators become'worn, the ap aratus illustr'ated in theaccompanying awings has been designed for the commutatorslindricalavhile the machine is in .motion. sishownfthis apparatus espe-.,cially adapted 'to-clamp onto the brush ho ders of. dynamos and motors.

that a'rese'cured in frames? and 4, which framescarry a third parallelrod 5.- The frames '3jand 4 are formed with sockets 6 having lugs orflanges 7 'rovided with screws 8 to securely. hold the r0 s 9 at rightangles to through rods 1 and 5. Slide the plane pass able on these ro s9 are the frames 10 andll,

which are connected acrossiby the rods 12.

These frames l0'and11 support the bearings In thedrawingg'land 2 areparallel rods for, the arbor'sleeve'. The 'rods'l and5 are connectedmidway between the frames?) and 4 by afbr'acket 13, and the rods 12 areagainconn ed the bracket 14, midway tween the frames 10 and 11. l

a screw 15 isthreaded in'thebracket 13 and its reduced "end is revolublein the bracket 14, the nuts 16 at its lower end preventing longitudinalmovement with refer-.

frames 10 and 11 sliding on the rods 9.

. -The dynamo shown in (i is provided I with the usual series. ofbrushholders 21, the brushes being shown removed from three of them.The, apparatus is shown secured toone of the brush holder has 22 bymeans of clamps (Figs. 2, 3 and which consist of a body portion 23having sleeves 24 to fit on the rods 1' and 2. The opposite end 25 ofthe body portion together with a jaw 26 forms an adjustable clamp toengage. the brush holder post 22; The screws 27 and 28 permit adjustmentwithin a considerable range; When jpossible, a" pain of :these same.

- 33 carrying the screw 3 and roller 35. Pivclamps are employed. As theclamps may be secured at any angle on the posts 22, the

whole apparatus can be readily positioned frame is provided with abracket and has a screw 31 secured therein on which is mounted the.roller-.32. The head of the screw is journaled in the bracket and-en-'gages the endof the hub of the roller and thus prevents endw'isemovement of the Theframe 11 has a similar bracket oted to the frame 11is an arm 36which carries a roller. 37 adapted to bear on the upper sideof the sleeve 38 that supports the emery wheel arbor 47. A screw 39 ishinged to the bracket 3 3-and carries a washer 40 that fits in asocket-in the endof the arm 36. A'

spring 41 and nut 42" determine the pressure on the end of the arm 36.By lifting the washer 40 out 'of its socket, the screw 39.is freed to beswung out ofthe slot 43 in the arm 36 so as to release the same,permitting it to be swung up and the sleeve 38 to be removed.

The grinding mechanism,'pro er, maybe of any desired construction, amtheemery .wheel 45 may be driven by electricity, Heir.

bleshafting or other means. In Fig. 8, the

- sleeve 38 is shown provided with three bear- .thimblc 52 whichfurnishes a bearing for that end of the .arbor. A collar 53 on the arbor'bears against the case, and together with the thimble 52, preventsendwise movement of the arbor. he armature 54 is secured to the arbor,field magnets and. brushes 56 are carricd'by the case. Binding scfl'iws57 are adapterhto connect in the wires which carry the neccssaryicurrent. A collar 58 may be positionedat-any point on the sleeve 33 andlrvscontactiiig with the bracket 30 )revent thecmcry wheel being movedin too iar. A handle 59 used by the operator for manipulating theapparatus.

\Yhcrc no electric current is obtainable,

I the flexible shaft 60 shown in Fig. I may be employed. 'lhis shaftattaches at one end to the arbor 47 m the usual manner and at the otherend connects to the shaft of the '64 which holds the wheel 61 in contactwith them-mature.

To hold the apparatus rigid when 111 posi- "posts 57 on the motor case.-maclnne is a dynamo, the driving englnewill tion, we provide a rod orpost 66, at the up-' per end of which is an adjustable attachment {37adapted to be s'e'curedto the rod 1. its lower endisthe'adjustablc'foot' 68 (Figs. 11' and 12) providedwith lugs 69 throughwhich and through .the lower end of the post passes the bolt 70. i Thepost may be turned and the foot placed as desired and all partsthenlocked in position. A

In Figs. 9 and 10 we have illustrated a grindingwhecl adapted to polishthe .commutator-after being ground true. It-consists of a disk 72, ran73, hub 74 and removable wedge 75. The strip 96 of sand paper or othersuitable material with a felt backing is passed around the rim andits-ends are held in place by the Wedge 75: The screw 76 passes throughthe wedge and engages the removable nut 77, normally held'm-thc socket78. The enlargenient79 of tlie' rim balances the wheel. I a

It. sometimes happens that, the clamp shown in Figs.3 and4cannot bereadily at;-

-tached to the ,brush holders. In such cases 'the necessary brushholders are 'rem'ovedfand the attachment shown in Figs. 13 and l4-sub-'stituted. This-consists of a'body portion 80' having a slot 81 throughwhich the boltsithat secure the brush holders in position may extend;When secured in position, the post 82 clamps 23 may attach.

furnishes convenient means, upwhich'thc The operation of the apparatus isias follows: After removing the brushes from their holders wherenecessary, the apparatus is secured in position so that the emery wheelwill be just free from the commutator.- The postfifi is then placed andwires from the electric system connected to the binding If the electricsupply power, if a motor, the machine must revolveitself. The emerywhcelis then fee moved forward and back alon r the face o f the Iconnnutator, being mover toward the same by means of the screw 15 untilthe commutator hasbeen ground true. wheel is then replaced. by thepolishingwhecl shown in Figs. 9 and 10. The support of the inward end ofthe shew-.38 being yicldable,

all danger of the motor ofthc grinder burning out because of overloadisavoided- The operator grasps the handle 59 at all times and soconstantly feels the working of the apparatus.

Having now explained my improvements, what we claim as our invention anddesire to secure by Letters ,Patent, is-

1. In a commutator grinder, the combination of a frame,-means to rigidlysecure the The emery same to an electric machine, a second frame,

means to relatively ad ust the frames,.a longitudinally slidable tubularsleeve, a rotary arbor carried thereby, a grinding-wheel mounted on thearbor at one end of the sleeves, andan electric motor to revolve thearbor eonneotedto the same at the other end '2. Infa'eommutator'grinder, the combine:

'tion of a frame, means to rigidly secure the' same t'o th e brushholders of'an eleetric'niaehinejaseeond frame, bearings carried thereby, one being .y eldehle, means to relatively adjust: the frames, alongitudinally" slidable .sleeve,- a rotary arbor earned thereby,agnndmg wheel mounted on one end of the arbor, and an electric motorcarried mrone' end of the's'leei'e to drive said nrhor.

' 3'. In acommuta-to'r grinder, the'c ombina "tion of a frame, In'eansto rigidly secure the s'ame' to an electric machine, a second frame,

meanstorelatively adjustthe frames, guide rollers carried by the secondframe, 'a longitudinally sli'dable- 'sleeve carried by said rollers,arotary-arbor-mount ed in's'aid sleeve,

j and grinding means mounted 'onsaid shaft.

'- 4 .)In a cominutator grinder, thecombinae .i t'ion of a pluralityof'rods rigidly connected parallel to each other, means for securing.

the, same to aneleetric machine,- a 'lurality ofrods'mounted formovementre ati ve' to the firstfhearin'gs comprising rollers carried on saidrollers;

by said'ro.ds,.and grinding moans nolinted In a'commutator grinder,theicomhina- 1 tion of a plurality of parallel rods rigidly con: ,neetedtogether, means for securing the same-to an electric machine, guide rods'mountedat right angles to 'thefirst;fraines Inovably mounted'on saidguide rods ,-,hear

.ingrollers molinted 'on sarid frames, a sleeve longitudinally movableon said rollers, and grindingmeans mounted in said'sleeve; In acommutator grinder; the combine-I t'ion of paralleijjrogls rigidlyconnected to an electric mtiachinrg mlide rods mounted at Jright anglesto .the first, lrameslnovebly ing, Witnesses.

"mouiited on said guide-rods, 'hearin scar-- ried by said frames, asleeve longitu many I v .45

movable on saidbearings, and arremery- .wheel-arbor mounted in saidsleeve.

"if. Ina commutator grinder, the combine tion of an adjustable frame,hearings carrier thereby, -a tubular sleere'slidabl'e; longitudinally'insaid hearings, an arbor journaletl in'said sleeve,-agrinding.- wheel mounted at one end'of the arbor at one end of thesleeve,

aease connected 'to the other end of the said case andoperativly-conneeted'to said arbor:

-"sleeve, andan'eleetr'ic motor mounted in",

8; In a commutator grinder, thec mhina-' tion ,of a frame, a. hearingcomprising a. .vrooved roller at one end of sa1d fra1ne,-a

hearing eom rising a rigid grooved roller and a a 5 eeve movablelongitudinally in said bear ings, and an-aii bor mounted-in said"'slceYe;

9. In a-eommutator grinder, the combina tion of aframe, a .clampyhdapmd'tofseeure one end of the same. to the brush holder of'a'n sFring-hel,roller atthe other-endithereof, 7

elctric'machine, means to support the-free end of the same,'-a-'secondframe, ruidesse cured to the frame to sup 'ort tli second,

a screw to. provide relative a justment of the frames, hearings-'rovided on the second frame, a cylindrica tube longitudinally-slidable'in the hearings, an arbor mounted inthe tube, and a-grindingwheel'mounted on Oneendof'the arborw resence-of. two suhscrib

